It's a really nice idea and with the time you were given, it's well executed. I do think you've got a lot in here, which is commendable, but maybe it would have been better to narrow the scope to having only one character playable, give them good combat options beyond attack/heal/mana restore and you'd be good, when that's finished, to make the other characters IF there's time.
It would have been nice to have the squares highlighted that I can move to EVEN if theres a chest on them. It's a minor nitpick,cause obviously I was moving in a Knight pattern so it was kinda clear but I think having it clearer in a way to say "Hey, you can go on this special space too!" would be good.
All of this to say, I hope you continue to work on this because I really think it has legs! Could be a fantastic full game, I say!